Heterotic/type I duality, D-instantons and an N=2 AdS/CFT correspondence
Abstract
D-instanton effects are studied for the IIB orientifold T2/I(-1)FL of Sen using type I/heterotic duality. An exact one loop threshold calculation of t8 F4 and t8( F2)2 terms for the heterotic string on T2 with Wilson lines breaking SO(32) to SO(8)4 is related to D-instanton induced terms in the worldvolume of D7 branes in the orientifold. Introducing D3 branes and using the AdS/CFT correspondence in this case, these terms are used to calculate Yang-Mills instanton contributions to four point functions of the large Nc limit of N=2 USp(2Nc) SYM with four fundamental and one antisymmetric tensor hypermultiplets.
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